Yesterday, a man with a 12-inch knife allegedly stabbed a police officer at Bishop International Airport in Flint. He also allegedly shouted out “God is great” in Arabic. The FBI says it’s investigating the attack as an act of terror.

While bleeding from the neck, Lieutenant Jeff Neville wrestled with the attacker until he was restrained by other officers.

50-year-old Amor Ftouhi, of Canada, has been arrested.

Steve Rukavina is a CBC reporter who says Ftouhi lives in an area of Montreal locally known as “little Magrehb” because of the neighborhood’s strong Muslim immigrant community. Rukavina says Royal Canadian and Montreal police were camped out at Ftouhi’s apartment, where he lived with his wife and three children.

The Canadian authorities say they are only assisting the FBI, which is leading the investigation.

Rukavina says Fthouhi’s landlord and neighbors were surprised to learn he had been arrested for the attack.

“They basically say as far as they knew that he was a quiet family man,” Rukavina said. “They’re surprised he would be accused of something like this.”

A study from the University of Michigan suggests engaging at-risk youth is a key tactic for understanding and preventing terrorism.

The study was led by U-M Research scientist Scott Atran and co-authored by professor of public policy Robert Axelrod.

According to the study, young adults often join extremist groups like ISIS because they are socially connected to others who have done the same. They say this is a response to being unable to organize in creative, nonviolent ways.

The head of Detroit’s FBI office says investigators have learned how and when Fthoui entered the U.S., but still can’t say why he ended up stabbing a security officer at Flint’s Bishop International Airport Wednesday.